21110554460 has 12 divisors (see below), whose sum is σ = 44332164408. Its totient is φ = 8444221776.

The previous prime is 21110554459. The next prime is 21110554471. The reversal of 21110554460 is 6445501112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527763842 + ... + 527763881.

It is an arithmetic number, because the mean of its divisors is an integer number (3694347034).

Almost surely, 2^21110554460 is an apocalyptic number.

21110554460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110554460 is an abundant number, since it is smaller than the sum of its proper divisors (23221609948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21110554460 is a wasteful number, since it uses less digits than its factorization.

21110554460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055527732 (or 1055527730 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The spelling of 21110554460 in words is "twenty-one billion, one hundred ten million, five hundred fifty-four thousand, four hundred sixty".